Drop bomb



29, 1 'r. E. MURRAY ETAL DROP BOMB Filed Dec. 6, 1939 2 Sheets-Sheet 1TI: E.

INVENTORS THOMAS MURRAY GEORGE H. PHELPS 4% ATTORNEY.

Feb. 29, 1944. 'r. E. MURRAY EI'AL 2,343,074

DROP BOMB Filed Dec. 6, 1939 2 Sheets-Sheet 2 I, h l

INVENTORS THOMAS E. MURRAY GEORGE H. PHELPS DROP BOMB Thomas. E. Murray,Brooklyn, and George H.-

Iheips, Floral Park, N. Y.; said Phelps assignor to Murray ManufacturingCorporation, Brookiyn, N. Y.,' a corporation of New York, and saidMurray assignor to Yarrum, 1110., Brooklyn, .1. Y., a corporation of NewYork Application December 6, 1939, Serial No. 307,728 i (01. ail-1.21) a6 Claims.

The invention herein disclosed relates to a' drop bomb and to a methodfor making such a bomb.

A primary object of the invention is to Provide a drop bomb that isreadily manufactured and suitable for rapid, quantity production.Another object of the invention is to provide a construction of a bombwhich lends itself to producing the major portion of the bomb irom platesteel. A further object of the invention is to provide a bomb that maybe constructed from plate and which has uniformity of strengththroughout. V

In accordance with the invention there is provided a drop bomb thatcomprises three portions, a body portion, a thicker intermediate portionand a nose portion. The body portion and thicker intermediate portionare made up of similar longitudinal sections drawn from plate whichplate comprises two pieces of plate of different thicknesses united inedge to edge relation. The sections areunited to form the body andintermediate portion of the bomb and .the nose portion is united'to theend of the intermediate portion.

Such a bomb is made in accordance with the method of the invention bystamping fiat blanks representing the development in a plane surface ofsections of the body and intermediate portions of the bomb, each blankcomprising two. pieces of plate of different thicknesses united in edgeto edge relation by a coalescence and ingraining oi the metal. Theblanks so formed are drawn to form sections which when united form thebody and intermediate portions of the bomb and the drawn sections areunited by electrically effecting a unification of the metal at theregistering edges. Thereafter, the formed 'nose portion is united to theend of the intermediate portion in a circumferential unification of themetal at the circular edges of the intermediate and nose-portions.

The blanks and drawn sections formed in the intermediate stages of themethod of this invention and a bomb embodying the invention areillustrated in theaccompanying drawings in which:

Fig. 1 is a side. elevation, partly in section, of a bomb;

Fig. 2 illustrates a plate in plan and edge elevation;

Fig. 3 illustrates another plate in plan and edge elevation; I

Fig. 4 illustrates a elevation; and

Fig. 5 illustrates a plan and end view of a drawn section.

The bomb illustrated in the drawings includes blank in plan and edge.three portions, a body portion I, an intermediate tapering portion 2having a thicker Wall than the wall of the body portion l and a noseportion 3. The body portion is cylindrical throughout the greaterportion of its length, tapering at its rear end la to the rear or tailend of-the the weld is worked.

'after the plates are joined together.

bomb. The body portion and the intermediate is reduced in thicknessalongone edge to form an edge portion 5 of the same thickness as the plate tobe used for the body portion l of the bomb. Fig. 2 illustrates a plate 6for the body portion of the bomb. This plate 6 is of uniform thicknessand the two plates are brought together in edge to edge relation withthe edge portion 5 of the plate 4 abutting against the end edge of theplate 6. In this relation a very high electrical current is caused topass between the two plates and at the same time the plates are'pressedtogether. In this manner the metal of the plates, at the joining edges,is caused to embed one within the other and a coalescence and ingrainingof the metal is effected. The burr formed in the welding of the twoplates may be removed.

The development in a plane surface of a longitudinally dividedhalf-section of the intermediate portion 2 of the bomb is indicated on.the plate 6 by the broken lines l. Similarly, the development in a planesurface of a longitudinally divided half-section of the body portion 6of the bomb is indicated by the broken lines ii on the plate Ii in Fig.2. These plates may be stamped along the broken lines either before orIn the event the plates are stamped prior to Welding, two blanks areformed and these are welded together in edge to edge relation. If theweld be efiected first, a single blank i3 shown in full lines in Fig. 4is stamped from the plate. The broken line ID of Fig. 4 indicate theoutline of the plate from which the blank 9 is stam ed.

In either event, the welded blank is flat. This condition greatlyfacilitates, and enhances the accuracy of, inspection of the weld. Inaddition, in the subsequent drawing operation, hereinafter described,the weld is automatically tested by the drawing operation, and the metalin the region of The blank 9 is placed between suitable dies and drawnto the concave section it illustrated in Fig. 5. This sectionconstitutes a longitudinally divided, half-section of the body andintermediate portions of theshell. It will be noted that the blank isdrawn so that the shoulder i2. f ormed b change in thickness of themetal is on his inside of the section ii. A smooth unbroken exteriorsurface is thus attained. Such a smooth unbroken surface on the exteriorof the bomb and a smooth unbroken interior surface may be attained byreducing the joining edge of the plate 6 in a smooth wedge shape. Thismay be done by removing all of the metal necessary to be removed fromone side of the plate or removing art from each side. p Two suchsections ll form the intermediate and body portion of the bomb. Thesesections are interchangeable and the two sections are laid incomplementarily recessed electrodes with their longitudinal edgesengaging and a unification of the metal at the registering edges iseffected in the manner heretofore described. To the end of theintermediate portion, the nose portion is welded. The nose portion is asolid piece of metal and it is united to the intermediate portion in acircumferential weld in the manner .described. The nose portion thus,forms a securing element between the longitudinally divided halfsectionsof the bomb. v

From the foregoing description of the bomb of this invention and themethod for making the bomb, it will be apparent that it is possible touse metals of different properties in the different sections of thebomb. In this way, the best possible characteristics for the bomb as awhole may be attained at minimum expense. As an example, the bomb mayconsist of a high alloy steel nose, an intermediate, section of lowalloy steel, and a body portion of plain low carbon steel. Likewise thebomb is suitable for manufacture, in accordance with the method of theinvention, in large quantities with available equipment.

It will be obvious that various changes may be made by'those skilled inthe art in the steps of the method and the details of the bomb disclosedin the drawings and described in detail above within the principle andscope of the invention as expressed in the appended claims.

We claim:

1. The method of making a drop bomb having a body portion, a thickertapering intermediate portion and a nose portion, which method includesthe steps of stamping flat blanks representing the development in aplane surface of .a section of the body and intermediate portions of thebomb, each blank comprising two pieces of plate of different thicknessunited in edge to edge relation to form a smooth unbroken surface on oneside by a coalescence and ingraining of the metal, drawing the blanks toform sections which when united form the body and intermediate portionsof the bomb, uniting the drawn sections by electrically effecting aunification of the metal which when united form of the metal. drawingthe blanks to form sections the body and intermediate portions of thebomb, uniting the drawn sec- 7 tions by electrically effecting aunification of the at the registering edges, and electrically uniting aformed nose portion to the end of the intermediate portion in acircumferential unification of the metal at the circular edges of theintermediate and nose portions.

2. The method of making a drop bomb having a body portion, a thickertapering intermediate portion and a nose portion, which method includesstumping a blank from uniform plate of one thickness, each blankrepresenting a development in a plane surface of a section of the bodyof the bomb, stamping blanks from uniform plate of a greater thickness,each blank representing a development in a plane surface of a section ofthe intermediate portion of the bomb, uniting the body and intermediateblank sections in edge to edge relation by a coalescence and ingrainingtrically effecting a unification metal at the registering .edses oi thesections, and electrically uniting a formed nose portion to the end ofthe intermediate portion in a circumferential unification of thecircular edges of the intermediate and nose portions.

3. The method of making a drop bomb having a .body portion, a thickertapering intermediate portion and a nose portion, which method includesreducing the edge thickness of one to the thickness of another plate oflesser thickness, uniting the plates in edge to edge relation by acoalescence and ingraiuing of the metal, stamping blanks from the unitedplate, each blank representing a development in a plane surface of asection of. the body and intermediate portions, drawing the blanks toform sections which when united form the body and intermediate portionsof the bomb, uniting the drawn sections by elecof the metal at theregistering edges of the sections, and electrically uniting a formednose portion, to the end of the intermediate portion in circumferentialunification of the metal at the circular edges of the intermediate andnose portions.

4. The method of making a drop bomb having a body portion, a thickertapering intermediate portion and a nose portion, which method includesreducing the edge thickness of one to the thickness of another plate oflesser thickness, uniting the plates in edge-to edge relation by acoalescence and ingraining of the metal, stamping blanks from the unitedplate,'each blank representing a. development in a plane surface of asemi-longitudinally divided section ofthe body and intermediateportions, uniting the drawn sections by electrically effecting aunification of the metal at the registering edges of the sections, andelectrically uniting a formed nose portion to the end of theintermediate portion in circumferential unification of the metal at thecircular edges of the intermediate and nose portions.

5. The method of making a drop bomb having a body portion, a thickertapering intermediate portion and a nose portion, which method includesthe steps of forming sections of the body portion and the intermediateportion from plate of different thicknesses, uniting these formedsections by electrically effecting a unification of the metal at theregistering edges, and electrically uniting a. formed nose portion tothe end of the intermediate portion in a circumferential unification ofthe metal at the circular edges of the intermediate and nose portions.

6. The method of making a, drop bomb having a .body portion, a thickertapering intermediate portion and a nose portion, which method includesthe steps of forming sections of the body and intermediate portions fromplate of difierent thicknesses including drawing plate to formlongitudinally divided sections of the said portions, uniting the edgesof the sections of such portions to form the said portions byelectrically effecting a. unification of the metal at the edges of thesections, and electrically effecting a unification of separately formedportions in a circumferentlal unification cular edge of the portions.

THOMAS E. MURRAY. GEORGE H.'PHELPS.

of the metal at the cir-

